Lucene.Net.Search.TestCachingWrapperFilter.TestNullDocIdSetIterator C# (CSharp) Method

        public virtual void TestNullDocIdSetIterator()
        {
            Directory dir = NewDirectory();
            RandomIndexWriter writer = new RandomIndexWriter(Random(), dir, Similarity, TimeZone);
            writer.Dispose();

            IndexReader reader = SlowCompositeReaderWrapper.Wrap(DirectoryReader.Open(dir));
            AtomicReaderContext context = (AtomicReaderContext)reader.Context;

            Filter filter = new FilterAnonymousInnerClassHelper2(this, context);
            CachingWrapperFilter cacher = new CachingWrapperFilter(filter);

            // the caching filter should return the empty set constant
            Assert.IsNull(cacher.GetDocIdSet(context, (context.AtomicReader).LiveDocs));

            reader.Dispose();
            dir.Dispose();
        }